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Hydrogel capable of degrading and sensing to environment and preparation process and using thereof

An environmentally sensitive, hydrogel technology, applied in the field of polymer chemistry, can solve the problems of limited application scope, difficult biodegradation and environmental degradation, etc., and achieve the effects of excellent water absorption performance, broad application prospects, and simple preparation method.

Inactive Publication Date: 2005-01-05
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They are all hydrogels obtained by addition polymerization of vinyl monomers. The monomers are connected by carbon-carbon bonds. They have strong chemical stability and are difficult to biodegrade and environmental degradation. The scope of application is limited.

Method used

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  • Hydrogel capable of degrading and sensing to environment and preparation process and using thereof
  • Hydrogel capable of degrading and sensing to environment and preparation process and using thereof
  • Hydrogel capable of degrading and sensing to environment and preparation process and using thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: add 50 grams of D in the round-bottomed flask that mechanical stirring is housed, L-polylactic acid (n=80-100) and 400 milliliters of epichlorohydrin, after fully stirring, add 100 grams of sodium hydroxide aqueous solution ( 50wt%), stirred and heated, and reacted at 80° C. for 5 hours to obtain a white gel. Put the white gel into a Soxhlet extractor, remove unreacted monomers and impurities in the white gel with 95% ethanol, and dry in vacuum to obtain polylactic acid hydrogel with a yield of 95%. Its water absorption rate is 50.

Embodiment 2

[0021] Embodiment 2: add 35 grams D in the round-bottomed flask that mechanical stirring is housed, L-polylactic acid (n=20-30) and 300 milliliters of epichlorohydrin, after fully stirring, 100 grams potassium hydroxide aqueous solution (50wt %), stirred and heated, and the controlled reaction was carried out at 100° C. for 10 hours to obtain a white gel. Put the white gel into a Soxhlet extractor, remove unreacted monomers and impurities in the white gel with 95wt% ethanol, and dry in vacuum to obtain polylactic acid hydrogel with a yield of 94%. Its water absorption rate is 200.

Embodiment 3

[0022] Embodiment 3: Add 20 grams of poly(meso-lactic acid) (n=20-30) and 100 milliliters of epichlorohydrin in the round bottom flask equipped with mechanical stirring, after fully stirring, add 50 grams of 50wt% hydroxide Sodium and 75 grams of potassium hydroxide aqueous solution were stirred and heated, and the controlled reaction was carried out at 80° C. for 8 hours to obtain a white gel. Put the white gel into a Soxhlet extractor, remove unreacted monomers and impurities in the white gel with 95% ethanol, and dry in vacuum to obtain polylactic acid hydrogel with a yield of 94%. Its water absorption rate is 1500.

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PUM

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Abstract

The invention relates to a degradable environmental sensitive hydrogel, mixing poly-lactic acid with epoxy compound, adding in 30wt%-50wt% of inorganic alkali water solution, making copolymerization reaction at 0 deg.C-120 deg.C for 2-20 hours, and obtaining the hydrogel. The hydrogel can act as biodegradable material to be used in the fields of medicine controlled release, tissue engineering, soil water storage or desert control, etc. The raw materials sources are rich, the preparing method is relatively simple. The hydrogel has excellent water absorbing property, and its swelling behavior can be automatically regulated and degradable with the variation of environmental acid salt tolerance and organic solvents, and has wide application prospect in many fields of agriculture, environment, biomedicine, etc.

Description

technical field [0001] The invention relates to a degradable environmentally sensitive hydrogel, a preparation method and application thereof, and belongs to the field of polymer chemistry. Background technique [0002] So far, the hydrogels prepared by synthetic methods are mainly poly(N-isopropylacrylamide) and polyacrylic acid and its derivatives hydrogels. They are all hydrogels obtained by polyaddition reaction of vinyl monomers. The monomers are all connected by carbon-carbon bonds. They have strong chemical stability, are difficult to biodegrade and environmental degradation, and their application range is limited. Contents of the invention [0003] The object of the present invention is to provide a kind of degradable environmentally sensitive hydrogel and its preparation method and application. [0004] The technical solution provided by the invention is: degradable environmentally sensitive hydrogel, which is produced by copolymerization of polylactic acid and e...

Claims

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Application Information

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IPC IPC(8): A61K9/00C08G63/91C09K17/18
Inventor 刘立建杨小钢
Owner WUHAN UNIV